Stair.



PATBNTED- MAY 3o, 1905. P. A. WINsLoVs.

STAIR.

APPLICATION FILED MAB.. 27. 1905.

B wb

UNITED STATES Patented May 30, 1905.

PATENT OFFICE.

FRANCIS A. WINSLOVV, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VVINSLOVBROS. COMPANY, OF CHICAGO, ILLINOIS, A CORPO- RATION OF ILLINOIS.

STAIFI.I

SPECIFICATION forming part of Letters Patent No. 791,065, dated May 30,1905,

To all whom t may concern:

Be it known that I, FRANCIS A. WINsLow, a citizen of the United Statesof America, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Stairs,of which the following is a specification.

My invention relates to certain new and useful improvements in stairs;and its object is to produce a device of this class which shall havecertain advantages which will appear Inore fully and at large in thecourse of this speciiication.

To this end my invention consists in certain novel features, which areshown in the accompanying drawings as embodied in my preferred form ofconstruction.

In the aforesaid drawings, Figure 1 is a longitudinal section through aportion of my improved stairway; and Fig. 2 is a horizontal section inthe line 2 2 of Fig. 1, the cement or filling material being removed.

Referring to the drawings, A is one of the side plates of my improvedstairway, and the same is preferably constructed of metal and may be ofany desired form. The risers B of my stairway are provided withrearwardlyprojecting ears b b, Fig. 2, and dotted lines, Fig. 1, throughwhich are passed bolts to secure the risers to the side plates A. Eachriser has at its lower edge a diagonally-disposed portion B, the upperface of which is preferably curved, so that the stairway can be readilycleaned. The upper edge of each riser is provided with aforwardly-extending portion B2, which gives a broader tread to the stairand provides it with an ornamental finish.

The diagonally-disposed portions B are provided with notches b2 b3 ontheir upper and lower edges, respectively, and after the risers aresecured to the side plates sheet- Application led March 27, 1905. SerialNo. 252.193.

metal plates C are sprung into place between theadjacent notches on therisers, thereby forming upwardly-curved metal arches. After these plateshave been sprung into place the spaces upon them are filled in withconcrete to the level of the tread or, if desired, a suitable top finishused. This construction, it will be observed, produces a particularlystrong stairway with a minimum amount of labor. All that it is necessaryto do is to bolt the risers into place and spring in the plates C tocomplete the metal work of the stair.

I realize that considerable variation is possible in the details of thisconstruction without departing from the spirit of the invention, and Itherefore do not intend to limit myself to the specific form hereinshown and described.

I claim as new and desire to secure by Letters Patent- 1. In a device ofthe class described, the combination with a plurality of risers securedat their ends to suitable supports, of a plurality of metal archesengaging notches at the lower edges of the risers and bodies of plasticmaterial upon said arches.

2. In a device of the class described, the combination with a pluralityof risers suported at their ends and provided at their ower edges withlongitudinal notches, of upwardly-bowed meta lic plates sprung intoplace between said notches and bodies ofplastic material upon saidplates.

YIn witness whereof I have signed the above application for LettersPatent, at Chicago, in the county of Cook and State of Illinois, this21st day of March, A. D. 1905.

FRANCIS A. WINSLOW.

lVitnesses:

CHAs. P. LAXE, fr M. D. MILLNER.

